Copper production - Country rankings 
http://aikidoyukishudokan.com/forum/member.php?402535-MiguelLer 
 
Top 5 Copper Producing Countries in The World 
http://forum.dipti.com.bd/index.php?topic=341.0 
 
 
Copper in Additive Manufacturing: Newbie on the Rise 
http://www.phonegekko.com/showthread.php?tid=38445&amp;pid=96830#pid96830 
 
Manufacturing Process of Copper 
http://ww.i-freego.com/viewthread.php?tid=2640827&amp;page=1&amp;authorid=3480069 
 
Porphyry Copper Deposits 
http://jl.kaoyanzhi.net/forum.php?mod=viewthread&amp;tid=9167695&amp;extra= 
 
The Ancient History of Copper 
http://camillacastro.us/forums/viewtopic.php?pid=119717#p119717